Complete echo command for scripting

> complete ECHO command that'll be used in Scripting

USAGE - 

- to print a message on terminal
>> echo Hello World
>> echo "Hello World"

- command inside double or single quotations are simple texts

- to run command inside/using echo
>> echo "$(command)"
>> echo "$(pwd)"

- display system variables using echo
>> echo "$variable"
>> echo "$SHELL"		prints the name and path of SHELL being used
>> echo "$USER"		prints name of the user

SYNTAX -

- echo [-enE] "[arguments]"
	
	- '-n' - doesnot print or execute next line command on new line but continues/appends on same line after the execution of current echo command
	- '-e' - we can use '\n' for newline argument or text after using -e as an option
		 - used to beautify the output or text using colour codes
		 - more options like \n in -e:
		   	- '\b' - removes one space back from where it is used
		   	- '\t' - creates horizontal tab spaces
		   	- '\v' - creates vertical tab spaces
		   	- '\a' - creates a sound alert
		   	- '\r' - used for carriage return
		   	- '\c' - suppresses any further outputs
		   	- '\\' - eliminates or skips the special purpose of backslash characters and prints it as it is
	- '-E' - executes like normal echo command, eliminates the special characters eventhough used in options


> ECHO command for Colours

- Reset Colour

Color_Off='\033[0m'       # Text Reset

- Regular Colors

Black='\033[0;30m'        # Black
Red='\033[0;31m'          # Red
Green='\033[0;32m'        # Green
Yellow='\033[0;33m'       # Yellow
Blue='\033[0;34m'         # Blue
Purple='\033[0;35m'       # Purple
Cyan='\033[0;36m'         # Cyan
White='\033[0;37m'        # White

- Bold

BBlack='\033[1;30m'       # Black
BRed='\033[1;31m'         # Red
BGreen='\033[1;32m'       # Green
BYellow='\033[1;33m'      # Yellow
BBlue='\033[1;34m'        # Blue
BPurple='\033[1;35m'      # Purple
BCyan='\033[1;36m'        # Cyan
BWhite='\033[1;37m'       # White

- Underline

UBlack='\033[4;30m'       # Black
URed='\033[4;31m'         # Red
UGreen='\033[4;32m'       # Green
UYellow='\033[4;33m'      # Yellow
UBlue='\033[4;34m'        # Blue
UPurple='\033[4;35m'      # Purple
UCyan='\033[4;36m'        # Cyan
UWhite='\033[4;37m'       # White

- Background

On_Black='\033[40m'       # Black
On_Red='\033[41m'         # Red
On_Green='\033[42m'       # Green
On_Yellow='\033[43m'      # Yellow
On_Blue='\033[44m'        # Blue
On_Purple='\033[45m'      # Purple
On_Cyan='\033[46m'        # Cyan
On_White='\033[47m'       # White

- High Intensity

IBlack='\033[0;90m'       # Black
IRed='\033[0;91m'         # Red
IGreen='\033[0;92m'       # Green
IYellow='\033[0;93m'      # Yellow
IBlue='\033[0;94m'        # Blue
IPurple='\033[0;95m'      # Purple
ICyan='\033[0;96m'        # Cyan
IWhite='\033[0;97m'       # White

- Bold High Intensity

BIBlack='\033[1;90m'      # Black
BIRed='\033[1;91m'        # Red
BIGreen='\033[1;92m'      # Green
BIYellow='\033[1;93m'     # Yellow
BIBlue='\033[1;94m'       # Blue
BIPurple='\033[1;95m'     # Purple
BICyan='\033[1;96m'       # Cyan
BIWhite='\033[1;97m'      # White

- High Intensity Backgrounds

On_IBlack='\033[0;100m'   # Black
On_IRed='\033[0;101m'     # Red
On_IGreen='\033[0;102m'   # Green
On_IYellow='\033[0;103m'  # Yellow
On_IBlue='\033[0;104m'    # Blue
On_IPurple='\033[0;105m'  # Purple
On_ICyan='\033[0;106m'    # Cyan
On_IWhite='\033[0;107m'   # White



-- Simple Script using Echo --

>> vi echo_basics.sh

<<<

#!/usr/bin/bash

echo "This a simple Text message"
echo "$(date)"
echo "Today's date is $(date)"
echo -n "Use of -n option."
echo "This line will not be printed on newline as '-n' is used in previous command."
echo 															# displays an empty line. echo command without any options and arguments gives empty line
echo -e "This will print on First line.\nThis will print on next Line."

echo -e "\033[1;31mThis text will be Printed in Red and Bold font\033[0m"

>>>

>> chmod +x echo_basics.sh
>> ./echo_basics.sh